Transmission

Details Transmission Transmission

1998-12-18

2001-05-22

Fenstermacher, David (Department: 3682)

Endless belt power transmission systems or components

Pulley with belt-receiving groove formed by drive faces on...

Load responsive

C474S028000, C474S070000, C267S180000

Reexamination Certificate

active

06234925

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to a transmission, such as an infinitely or continuously variable speed transmission with pulleys having conical flanges, with a first pair of conical flanges and a second pair of conical flanges, each pair having an axially movable and an axially fixed conical flange, and looped torque transmitting means trained over the pairs of conical flanges, with at least one energy storing device disposed to operate between an axially fixed element and an axially movable conical flange.
Such transmissions became known, for example, from the published German patent application Ser. No. 195 44 644 and the corresponding U.S. Pat. No. 5,711,730. For example, such transmission can employ a coil spring, e.g., a compression spring, in order to achieve the establishment of a stress between an axially fixed element and an axially shiftable conical flange.
If such transmissions employ a cylindrical spring, it can happen that, when the spring is subjected to a pronounced axial stress, individual convolutions of the spring yield radially outwardly and become clamped between the axially movable conical flange and the axially fixed element. This entails the development of a pronouced adverse effect upon the operation of the transmission.
OBJECT OF THE INVENTION
The object underlying the present invention is to improve transmissions of the aforedescribed character as concerns their construction, cost and the mode of operation. The transmission is to be provided with an energy storing device which is rotatably confined in actual use of the transmission and does not accidentally block any of the elements.
SUMMARY OF THE INVENTION
In accordance with the invention, this is accomplished in that the energy storing device has a cross section slightly departing from a cylindrical shape, the cross section decreasing in a first axial region and increasing again in a second axial region. This ensures that, when the energy storing device is subjected to a pronounced axial stress, it assumes a shape such that the radially inner portions of the convolutions lie against an extension of the axially movable conical flange and do not migrate radially outwardly which could result in a clamping or blocking of discrete component parts of the transmission.
It is advisable to employ an energy storing device which is a compression spring or coil spring with discrete convolutions, at least the radially outer convolutions having—as seen in the radial direction—a diameter which is larger than that of at least some convolutions which are disposed radially inwardly as seen in the radial direction.
It is also desirable if the cross section of the energy storing device exhibits the shape of a double cone. It is also possible to impart to the cross section the shape of a dual conical frustum.
Furthermore, in accordance with an additional embodiment, it is advisable if the axially fixed element and/or the axially movable conical flange is provided with a receptacle which receives and supports against radially outward movement the convolutions located at the end zones of the energy storing device.
It is of advantage if the receptacle constitutes a circumferentially extending groove which is provided in the axially movable conical flange, which is surrounded radially by an extension and which receives at least one convolution at the end zone of the energy storing device, the convolution being supported by the extension as seen in the radial direction and being supported by the conical flange in the axial direction.
It is of advantage if the receptacle of the axially fixed element supports at least one convolution of the energy storing device, at the end region of the energy storing device, against movement outwardly as seen in the radial direction and also in the axial direction.
The invention further relates to a transmission, such as an infinitely variable transmission with pulleys having conical flanges, with a first pair of conical flanges and a second pair of conical flanges, each pair having an axially movable and an axially fixed conical flange, looped torque transmitting means trained over the pairs of conical flanges, and at least one plenum chamber. The plenum chamber is sealed by a seal which comprises an elastic sealing ring and an essentially shape-retaining annular element.
It is of advantage if the elastic sealing ring is disposed radially within the essentially shape-retaining annular element.
In accordance with another embodiment of the invention, it is advisable that the elastic sealing ring be disposed radially outwardly of the essentially shape-retaining annular element.


REFERENCES:
patent: 3405929 (1968-10-01), Kaplan
patent: 4077619 (1978-03-01), Borlinghaus
patent: 4717368 (1988-01-01), Yamaguchi et al.
patent: 5046991 (1991-09-01), Friedmann
patent: 5156573 (1992-10-01), Bytzek et al.
patent: 5295915 (1994-03-01), Friedmann
patent: 5711730 (1998-01-01), Friedman et al.
patent: 5879253 (1999-03-01), Friedmann et al.
patent: 6015359 (2000-01-01), Kunii
patent: 40 36 683 A1 (1991-05-01), None
patent: 42 34 294 A1 (1993-04-01), None
patent: 195 44 644 A1 (1996-06-01), None
patent: 308260 (1988-12-01), None

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